• Caliber: 5.56 NATO
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Spike's Tactical Forged M4 Flat Top Upper - Made from 7075-T6 aluminum
  • Handguard: Magpul SL M-LOK Handguard
  • M4 Feed Ramps: Yes
  • Muzzle Device: Mil-Spec A2 Flash Hider
  • Barrel: 16” 1:7 Twist Government profile 5.56 NATO Chrome Lined CMV Barrel
  • Muzzle Thread Pattern: 1/2"-28
  • Gas Block: Spike's Tactical .750 Micro Gas Block (A2 front sight gas block for 9" rail)
  • Gas Tube: Mid-Length Melonited Gas tube
  • Bolt Carrier Group: Spike's Tactical Mil-Spec M16 Bolt Carrier Group
  • Charging Handle: Mil-Spec Charging Handle
  • High Pressure Tested (HPT) and Magnetic Particle Inspected (MPI)


  • Weight: ~3 lbs. 14 oz.


  • AR-15 lower receiver


  • 1x Spike's Tactical Upper ST-15 LE 16" Mid-Length 5.56 Gov't Barrel w/ M-LOK Rail


Spikes Tactical Upper assembly have something for everyone. Whether you’re a fan of CHF components, the mean look of the M4 or the classic toughness of government profile barrels, they have you covered. When you choose the Spike's Tactical ST-15 upper assembly with 5.56 Government profile Barrel and M-LOK Rail, you get a blend of Mil-Spec and modernized features that will give you an edge in the real world whether you use it solely at the range, or you rely on it to protect what matters most.

The Spikes Tactical ST-15 is an Aluminum body upper receiver designed with the requirements of law enforcement operations in mind. It features extended feed ramps for better reliability and it’s lined with Drylube for smooth operation. Mil-Spec protective coatings will keep this Spikes Tactical Upper corrosion free and looking good even under heavy use.

So, if you’ve got Spikes ST-15, you’ve got a good upper. What you need is a reliable barrel to go with it. Spikes 16-inch government profile barrel fits the bill perfectly. This is no delicate flower. Spikes Tactical’s Government profile barrel is machined from a quality Chromoly Alloy that you can count on for strength and long wear. It’s hard chrome lined and the headspace is confirmed after plating so you can be confident that there won’t be any fit issues. Each Spikes Tactical barrel is high pressure tested, magnetic particle inspected and comes with Spikes warranty, so you know you have an extremely reliable barrel in your mid-length upper package.

Time to satisfy the progressive, modern side of the armorer in you. How better to do that than to add on the most modern, flexible, rail system on the market. Spike’s Tactical M-LOK rail system features M-LOK technology. The M-LOK mounting system allows the operator to change accessories quickly and easily, even in the field. Simply slot in the desired M-LOK or MOE accessory and turn the lugs to lock it into place. There’s no need to pull the hand guard and no end to the changes you can make. Accessories are held firmly in place until you decide you want to change them and it doesn’t take an act of congress to do it, just a minute or two and a simple turn of a couple of t-nuts and you’re on your way gain.

When you begin your build with a quality Spikes ST-15 LE 16 mid-length upper assembly from Spikes you’re well on your way to a great AR system. Add a few more pieces and you’ll have your very own custom AR-15 and the pride and satisfaction that goes with knowing you’ve done it yourself with quality components you can rely on.

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